Visualising Sec

This exercise is designed to give you a physical representation for the function:
and to recognise the pythagorean identity associated with it.

Try to follow the reasoning set by step.
1) before turning on the Traces try to predict what function is modelled in the unit circle
2) follow the arguments on the right to understand how appears in this diagram
3) what is the scale factor that enlarges OXXx into OTA